diff --git a/src/devices/sound/volt_reg.cpp b/src/devices/sound/volt_reg.cpp
index aeb2bd6285a..46c3e1471cf 100644
--- a/src/devices/sound/volt_reg.cpp
+++ b/src/devices/sound/volt_reg.cpp
@@ -5,6 +5,12 @@
     volt_reg.c
 
     Direct current.
+	
+	TODO:
+	- If we continue having this device in MAME, add support for default voltage other
+	  than (currently hardcoded) 5.0
+	- When used in combination with a DAC, vreg device 1st stream update is skipped,
+	  causing the DAC to fetch invalid input data. Why does this happen?
 
 ***************************************************************************/